Magnetospheric plasma regimes identified using Geotail measurements 2. Statistics, spatial distribution, and geomagnetic dependence

Details Magnetospheric plasma regimes identified using Geotail measurements 2. Statistics, spatial distribution, and geomagnetic dependence Magnetospheric plasma regimes identified using Geotail measurements 2. Statistics, spatial distribution, and geomagnetic dependence

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10323521c&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A10, p. 23521-23542

Physics

14

Magnetospheric Physics: Magnetotail

Scientific paper

We investigate the spatial distribution, solar-terrestrial correlation, and basic statistics of a long sequence of plasma regime identifications through the probability of observation P at downtail distances of ~30=3o, (d) The centroid of P(PS) lies duskward of the XAGSM axis, producing a distinct dawn-dusk asymmetry; (e) P(BL) increases sharply at xagsm>60RE and remains high tailward; and (f) At xagsm<75RE, MS is rarely observed for |YAGSM|<20RE. In the distant magnetotail (xagsm>100RE): (a) Conditions appear more chaotic. PS, BL, or MS can be observed anywhere inside the nominal magnetotail domain; (b) Compared to the middle magnetotail, PS and BL are observed more dawnward of the XAGSM axis and P(PS) is significantly lower (most distinctly at Kp>=3o) (c) P(PS) is centered dawnward of the XAGSM axis for both low and high Kp; and (d) At xagsm>170RE, P(BL) is greater than P(PS) or P(MS), with P(MS)~P(PS). P(LB)>0, but low, out to xagsm>=200RE. In general, the downtail distributions of the magnetospheric plasma regimes depend more strongly on xagsm than on Kp, however the YAGSM distribution of P(PS) depends strongly with both xagsm and Kp. Magnetotail width varies weakly with xagsm and Kp.

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